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openssl/crypto/cms/cms_dh.c
Matt Caswell 5ac8fb584a Rename EVP_PKEY_set1_tls_encodedpoint to EVP_PKEY_set1_encoded_public_key 
We do the same thing for the "get1" version. In reality this has broader
use than just TLS (it can also be used in CMS), and "encodedpoint" only
makes sense when you are talking about EC based algorithms.

Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org>
(Merged from https://github.com/openssl/openssl/pull/13105)
2020-10-20 16:39:41 +01:00

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/*
* Copyright 2006-2020 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <assert.h>
#include <openssl/cms.h>
#include <openssl/dh.h>
#include <openssl/err.h>
#include <openssl/core_names.h>
#include "cms_local.h"
static int dh_cms_set_peerkey(EVP_PKEY_CTX *pctx,
X509_ALGOR *alg, ASN1_BIT_STRING *pubkey)
{
const ASN1_OBJECT *aoid;
int atype;
const void *aval;
ASN1_INTEGER *public_key = NULL;
int rv = 0;
EVP_PKEY *pkpeer = NULL, *pk = NULL;
const unsigned char *p;
int plen;
X509_ALGOR_get0(&aoid, &atype, &aval, alg);
if (OBJ_obj2nid(aoid) != NID_dhpublicnumber)
goto err;
/* Only absent parameters allowed in RFC XXXX */
if (atype != V_ASN1_UNDEF && atype == V_ASN1_NULL)
goto err;
pk = EVP_PKEY_CTX_get0_pkey(pctx);
if (pk == NULL || !EVP_PKEY_is_a(pk, "DHX"))
goto err;
/* Get public key */
plen = ASN1_STRING_length(pubkey);
p = ASN1_STRING_get0_data(pubkey);
if (p == NULL || plen == 0)
goto err;
pkpeer = EVP_PKEY_new();
if (pkpeer == NULL
|| !EVP_PKEY_copy_parameters(pkpeer, pk)
|| !EVP_PKEY_set1_encoded_public_key(pkpeer, p, plen))
goto err;
if (EVP_PKEY_derive_set_peer(pctx, pkpeer) > 0)
rv = 1;
err:
ASN1_INTEGER_free(public_key);
EVP_PKEY_free(pkpeer);
return rv;
}
static int dh_cms_set_shared_info(EVP_PKEY_CTX *pctx, CMS_RecipientInfo *ri)
{
int rv = 0;
X509_ALGOR *alg, *kekalg = NULL;
ASN1_OCTET_STRING *ukm;
const unsigned char *p;
unsigned char *dukm = NULL;
size_t dukmlen = 0;
int keylen, plen;
const EVP_CIPHER *kekcipher;
EVP_CIPHER_CTX *kekctx;
if (!CMS_RecipientInfo_kari_get0_alg(ri, &alg, &ukm))
goto err;
/*
* For DH we only have one OID permissible. If ever any more get defined
* we will need something cleverer.
*/
if (OBJ_obj2nid(alg->algorithm) != NID_id_smime_alg_ESDH) {
CMSerr(0, CMS_R_KDF_PARAMETER_ERROR);
goto err;
}
if (EVP_PKEY_CTX_set_dh_kdf_type(pctx, EVP_PKEY_DH_KDF_X9_42) <= 0
|| EVP_PKEY_CTX_set_dh_kdf_md(pctx, EVP_sha1()) <= 0)
goto err;
if (alg->parameter->type != V_ASN1_SEQUENCE)
goto err;
p = alg->parameter->value.sequence->data;
plen = alg->parameter->value.sequence->length;
kekalg = d2i_X509_ALGOR(NULL, &p, plen);
if (kekalg == NULL)
goto err;
kekctx = CMS_RecipientInfo_kari_get0_ctx(ri);
if (kekctx == NULL)
goto err;
kekcipher = EVP_get_cipherbyobj(kekalg->algorithm);
if (kekcipher == NULL || EVP_CIPHER_mode(kekcipher) != EVP_CIPH_WRAP_MODE)
goto err;
if (!EVP_EncryptInit_ex(kekctx, kekcipher, NULL, NULL, NULL))
goto err;
if (EVP_CIPHER_asn1_to_param(kekctx, kekalg->parameter) <= 0)
goto err;
keylen = EVP_CIPHER_CTX_key_length(kekctx);
if (EVP_PKEY_CTX_set_dh_kdf_outlen(pctx, keylen) <= 0)
goto err;
/* Use OBJ_nid2obj to ensure we use built in OID that isn't freed */
if (EVP_PKEY_CTX_set0_dh_kdf_oid(pctx,
OBJ_nid2obj(EVP_CIPHER_type(kekcipher)))
<= 0)
goto err;
if (ukm != NULL) {
dukmlen = ASN1_STRING_length(ukm);
dukm = OPENSSL_memdup(ASN1_STRING_get0_data(ukm), dukmlen);
if (dukm == NULL)
goto err;
}
if (EVP_PKEY_CTX_set0_dh_kdf_ukm(pctx, dukm, dukmlen) <= 0)
goto err;
dukm = NULL;
rv = 1;
err:
X509_ALGOR_free(kekalg);
OPENSSL_free(dukm);
return rv;
}
static int dh_cms_decrypt(CMS_RecipientInfo *ri)
{
EVP_PKEY_CTX *pctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
if (pctx == NULL)
return 0;
/* See if we need to set peer key */
if (!EVP_PKEY_CTX_get0_peerkey(pctx)) {
X509_ALGOR *alg;
ASN1_BIT_STRING *pubkey;
if (!CMS_RecipientInfo_kari_get0_orig_id(ri, &alg, &pubkey,
NULL, NULL, NULL))
return 0;
if (alg == NULL || pubkey == NULL)
return 0;
if (!dh_cms_set_peerkey(pctx, alg, pubkey)) {
DHerr(DH_F_DH_CMS_DECRYPT, DH_R_PEER_KEY_ERROR);
return 0;
}
}
/* Set DH derivation parameters and initialise unwrap context */
if (!dh_cms_set_shared_info(pctx, ri)) {
DHerr(DH_F_DH_CMS_DECRYPT, DH_R_SHARED_INFO_ERROR);
return 0;
}
return 1;
}
static int dh_cms_encrypt(CMS_RecipientInfo *ri)
{
EVP_PKEY_CTX *pctx;
EVP_PKEY *pkey;
EVP_CIPHER_CTX *ctx;
int keylen;
X509_ALGOR *talg, *wrap_alg = NULL;
const ASN1_OBJECT *aoid;
ASN1_BIT_STRING *pubkey;
ASN1_STRING *wrap_str;
ASN1_OCTET_STRING *ukm;
unsigned char *penc = NULL, *dukm = NULL;
int penclen;
size_t dukmlen = 0;
int rv = 0;
int kdf_type, wrap_nid;
const EVP_MD *kdf_md;
pctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
if (pctx == NULL)
return 0;
/* Get ephemeral key */
pkey = EVP_PKEY_CTX_get0_pkey(pctx);
if (!CMS_RecipientInfo_kari_get0_orig_id(ri, &talg, &pubkey,
NULL, NULL, NULL))
goto err;
/* Is everything uninitialised? */
X509_ALGOR_get0(&aoid, NULL, NULL, talg);
if (aoid == OBJ_nid2obj(NID_undef)) {
BIGNUM *bn_pub_key = NULL;
ASN1_INTEGER *pubk;
if (!EVP_PKEY_get_bn_param(pkey, OSSL_PKEY_PARAM_PUB_KEY, &bn_pub_key))
goto err;
pubk = BN_to_ASN1_INTEGER(bn_pub_key, NULL);
BN_free(bn_pub_key);
if (pubk == NULL)
goto err;
/* Set the key */
penclen = i2d_ASN1_INTEGER(pubk, &penc);
ASN1_INTEGER_free(pubk);
if (penclen <= 0)
goto err;
ASN1_STRING_set0(pubkey, penc, penclen);
pubkey->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
pubkey->flags |= ASN1_STRING_FLAG_BITS_LEFT;
penc = NULL;
X509_ALGOR_set0(talg, OBJ_nid2obj(NID_dhpublicnumber),
V_ASN1_UNDEF, NULL);
}
/* See if custom parameters set */
kdf_type = EVP_PKEY_CTX_get_dh_kdf_type(pctx);
if (kdf_type <= 0 || !EVP_PKEY_CTX_get_dh_kdf_md(pctx, &kdf_md))
goto err;
if (kdf_type == EVP_PKEY_DH_KDF_NONE) {
kdf_type = EVP_PKEY_DH_KDF_X9_42;
if (EVP_PKEY_CTX_set_dh_kdf_type(pctx, kdf_type) <= 0)
goto err;
} else if (kdf_type != EVP_PKEY_DH_KDF_X9_42)
/* Unknown KDF */
goto err;
if (kdf_md == NULL) {
/* Only SHA1 supported */
kdf_md = EVP_sha1();
if (EVP_PKEY_CTX_set_dh_kdf_md(pctx, kdf_md) <= 0)
goto err;
} else if (EVP_MD_type(kdf_md) != NID_sha1)
/* Unsupported digest */
goto err;
if (!CMS_RecipientInfo_kari_get0_alg(ri, &talg, &ukm))
goto err;
/* Get wrap NID */
ctx = CMS_RecipientInfo_kari_get0_ctx(ri);
wrap_nid = EVP_CIPHER_CTX_type(ctx);
if (EVP_PKEY_CTX_set0_dh_kdf_oid(pctx, OBJ_nid2obj(wrap_nid)) <= 0)
goto err;
keylen = EVP_CIPHER_CTX_key_length(ctx);
/* Package wrap algorithm in an AlgorithmIdentifier */
wrap_alg = X509_ALGOR_new();
if (wrap_alg == NULL)
goto err;
wrap_alg->algorithm = OBJ_nid2obj(wrap_nid);
wrap_alg->parameter = ASN1_TYPE_new();
if (wrap_alg->parameter == NULL)
goto err;
if (EVP_CIPHER_param_to_asn1(ctx, wrap_alg->parameter) <= 0)
goto err;
if (ASN1_TYPE_get(wrap_alg->parameter) == NID_undef) {
ASN1_TYPE_free(wrap_alg->parameter);
wrap_alg->parameter = NULL;
}
if (EVP_PKEY_CTX_set_dh_kdf_outlen(pctx, keylen) <= 0)
goto err;
if (ukm != NULL) {
dukmlen = ASN1_STRING_length(ukm);
dukm = OPENSSL_memdup(ASN1_STRING_get0_data(ukm), dukmlen);
if (dukm == NULL)
goto err;
}
if (EVP_PKEY_CTX_set0_dh_kdf_ukm(pctx, dukm, dukmlen) <= 0)
goto err;
dukm = NULL;
/*
* Now need to wrap encoding of wrap AlgorithmIdentifier into parameter
* of another AlgorithmIdentifier.
*/
penc = NULL;
penclen = i2d_X509_ALGOR(wrap_alg, &penc);
if (penc == NULL || penclen == 0)
goto err;
wrap_str = ASN1_STRING_new();
if (wrap_str == NULL)
goto err;
ASN1_STRING_set0(wrap_str, penc, penclen);
penc = NULL;
X509_ALGOR_set0(talg, OBJ_nid2obj(NID_id_smime_alg_ESDH),
V_ASN1_SEQUENCE, wrap_str);
rv = 1;
err:
OPENSSL_free(penc);
X509_ALGOR_free(wrap_alg);
OPENSSL_free(dukm);
return rv;
}
int cms_dh_envelope(CMS_RecipientInfo *ri, int decrypt)
{
assert(decrypt == 0 || decrypt == 1);
if (decrypt == 1)
return dh_cms_decrypt(ri);
if (decrypt == 0)
return dh_cms_encrypt(ri);
CMSerr(0, CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
return 0;
}
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